JP5693352B2 - Imaging lens - Google Patents

Description

  The present invention relates to an imaging lens used in an imaging apparatus equipped with a solid-state imaging device, such as a monitoring camera or a vehicle-mounted camera, and more particularly to a single-focus wide-angle imaging lens.

  Imaging lenses used for surveillance cameras and in-vehicle cameras are expected to be used in various regions from the cold to the tropics, and the white line recognition front camera that has been spreading in recent years has a longer driving time than the rear engine. It is necessary to consider heat generating devices such as systems, and an optical design that can be used in a wider temperature range is required. Further, it is required that the imaging performance is good over the entire screen while ensuring a wide angle of view. Furthermore, since the mounting space is often limited, it is also required to be small and lightweight.

  The following Patent Document 1 has been proposed as a single-focus wide-angle imaging lens that can possibly meet these demands. However, the single focus lens described in Patent Document 1 is not designed in consideration of temperature fluctuations when a resin lens is used, and thus the focus position may be shifted.

JP 2009-008867 A

  The present invention has been made in view of the above points, and the object is to design a four-element optical system that is resistant to temperature fluctuations, while having high weather resistance and optical performance, To provide a small and thin wide-angle imaging lens by appropriately setting the shape of the lens, the shape of the aspherical surface, and the like.

In order to achieve the above object, the lens of the present invention includes, in order from the object side, a first lens having negative refractive power with a convex surface facing the object side, and a resin material having negative refractive power with the convex surface facing the object side. a second lens in which is formed, a spherical surface, you chromatic and third lenses having a positive refractive power with a convex surface facing the object side, an aperture stop, a positive refractive power having a convex surface on the image side A fourth lens formed of a resin material is disposed, and the following conditional expressions (1) to (5) are satisfied.
−0.9 ≧ f2 / f4 ≧ −1.1 (1)
−10.0 ≦ f1 / f ≦ −6.0 (2)
−5.0 ≦ f2 / f ≦ −3.0 (3)
3.0 ≦ f3 / f ≦ 5.0 (4)
2.0 ≦ f4 / f ≦ 6.0 (5)
Where f is the focal length of all lenses, f1 is the focal length of the first lens, f2 is the focal length of the second lens , f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens.

  Preferably, the Abbe number for the d-line of the material constituting the first lens is 40 or more, the Abbe number for the d-line of the material constituting the second lens is 50 or more, and the d-line of the material constituting the third lens The Abbe number is set to 40 or less, and the Abbe number to the d-line of the material constituting the fourth lens is set to 50 or more.

Preferably the fourth lens and the second lens has at least one surface of each is made of a resin material, characterized in that it is a non-spherical surface.

  Preferably, the third lens is formed of a glass material.

Preferably, the entire angle of view satisfies the following conditional expression.
2W ≧ 130 °
However, 2W: The total angle of view of the light ray incident on the maximum image height position on the imaging plane.

  According to the imaging lens of the present invention, it is possible to provide an imaging lens that is resistant to temperature fluctuations by controlling the power of each lens. Furthermore, it is possible to provide a wide-angle imaging lens that is compact and has various aberrations corrected satisfactorily by controlling the Abbe number, angle of view, and focal length.

It is a figure which shows the basic composition of the imaging lens in embodiment of this invention. It is a figure which shows the aperture | diaphragm | squeeze part of the imaging lens and the surface number provided with respect to each lens in embodiment of this invention. In Example 1, it is an aberrational figure which shows spherical aberration, distortion aberration, and astigmatism. 6 is a diagram illustrating a configuration of an imaging lens employed in Example 2. FIG. In Example 2, it is an aberrational figure which shows spherical aberration, distortion aberration, and astigmatism. 6 is a diagram illustrating a configuration of an imaging lens employed in Example 3. FIG. In Example 3, it is an aberrational figure which shows spherical aberration, distortion aberration, and astigmatism. 6 is a diagram illustrating a configuration of an imaging lens employed in Example 4. FIG. In Example 4, it is an aberrational figure which shows spherical aberration, a distortion aberration, and astigmatism. 6 is a diagram illustrating a configuration of an imaging lens employed in Example 5. FIG. FIG. 10 is an aberration diagram showing spherical aberration, distortion, and astigmatism in Example 5.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows the lens configuration of the embodiment in an optical section. In these embodiments, in order from the object side, the first lens 110, the second lens 120, the third lens 130, the aperture stop 140, the fourth lens 150, a CCD (Charge Coupled Device) and a CMOS (Complementary Mental-Oxide Semiconductor device). This is a single-focus lens 100 having a four-lens configuration in which an imaging element 160 such as the above is arranged.

The single focus lens 100 as an imaging lens embodying the present invention is preferably configured to satisfy the conditional expression (1).
−0.9 ≦ f2 / f4 ≦ −1.1 (1)
Here, f2 is the focal length of the second lens 120, and f4 is the focal length of the fourth lens 150.

  When the upper limit of (1) is exceeded, the focal length of the second lens 120 becomes longer than the focal length of the fourth lens 150, and the power of the second lens 120 becomes weaker than the power of the fourth lens 150, so that the temperature is changed. The focus position shifts to the object side, and it becomes difficult to obtain a wide-angle imaging lens having high optical performance. On the other hand, when the lower limit is exceeded, the focal length of the second lens 120 becomes shorter than the focal length of the fourth lens 150, and the power of the second lens 120 becomes stronger than the power of the fourth lens 150. In addition, the focus position is shifted to the image side, and it is difficult to obtain a wide-angle imaging lens having high optical performance.

  The four lenses in the imaging lens 100 embodying the present invention are meniscus lenses that work in order to obtain a wide angle of view by having a negative refractive power with the convex surface facing the object side in order from the object side. One lens 110, a second lens 120, which is a meniscus lens having a negative refractive power, which is advantageous for downsizing and has a low manufacturing difficulty by directing a convex surface toward the object side, and positive refraction with the convex surface directed toward the object side The third lens 130 that facilitates correction of aberrations by having power, and the fourth lens 150 that has a positive refractive power with the convex surface facing the aperture stop 140 and the image side, thereby reducing the incident angle on the image plane. It is arranged like this.

  In the imaging lens 100, the light incident from the object side OBJS is the object side R1 surface 1, the image surface side R2 surface 2 of the first lens 110, the object side R3 surface 3, the image surface side R4 surface 4 of the second lens 120, The imaging element 160 sequentially passes through the object side R5 surface 5, the image surface side R6 surface 6, the surface 7 of the aperture stop 140, the object side R8 surface 8 and the image surface side R9 surface 9 of the fourth lens 150 of the third lens 130. It is focused on.

  In the present embodiment, the case where a meniscus lens is used as the first lens 110 has been described. As described above, by using the meniscus lens, it is possible to make it difficult to generate a ghost, but it is not necessary to be limited to this.

  Further, since the second lens 120 and the fourth lens 150 are formed of a resin material, weight reduction and cost reduction can be realized, and an aspherical shape can be easily manufactured. Further, each of these lenses is formed with at least one aspherical shape, whereby aberration correction can be facilitated, and good resolution performance can be obtained while being small.

  In addition, since the combination of the power of the second lens 120 and the fourth lens 150 made of a resin material is negative and positive, the temperature characteristics of the refractive index can be offset. In general, a resin material has a larger change in refractive index due to a temperature change than a glass material, and its refractive power is small at a high temperature and large at a low temperature. Therefore, in the present invention, each of the negative and positive lenses is made of a resin material and the focal length is made closer to cancel out this change in refractive power, thereby reducing the change in focal length in the entire lens system. Desired performance can be obtained even in the temperature range.

  Furthermore, as a factor that influences power, there is a change in the lens shape due to temperature, and the linear expansion coefficient of the resin material is also involved. Accordingly, the resin material forming the second lens 120 and the fourth lens 150 can be expected to be more effective by using the same material or a material having a similar linear expansion coefficient.

  Further, by forming the third lens 130 from a glass material, a material having a wide dispersion value can be selected, and as a result, the lateral chromatic aberration can be favorably corrected. Specifically, by using a glass material having a high dispersion value for the third lens 130, an advantageous effect for correcting chromatic aberration generated in the first lens 110 and the second lens 120 is obtained.

  That is, in the present invention, the second lens 120 and the fourth lens 150 are made of a resin material to reduce the weight and reduce the cost, and form an aspheric shape that can be easily manufactured to correct aberrations. Furthermore, the temperature characteristics are offset by the combination of the negative and positive powers of these lenses. In addition, by selecting a high dispersion value using the third lens 130 as a glass material, it is also effective in correcting chromatic aberration, so that it is a compact, lightweight, high resolution performance, and a wide angle with excellent temperature characteristics. The lens is realized.

  The aspherical shape of the lens described in the following numerical examples is positive in the direction from the object side to the image plane side, k is a conical coefficient, and A, B, C, and D are aspherical coefficients. , R is the central radius of curvature, h represents the height of the light beam, and c represents the reciprocal of the central radius of curvature. Where Z is the depth from the tangent plane to the surface vertex, A is the fourth-order aspheric coefficient, B is the sixth-order aspheric coefficient, C is the eighth-order aspheric coefficient, and D is the tenth-order non-spherical coefficient. Each spherical coefficient is represented.

  In the imaging lens 100 according to the present invention, the Abbe number of the material constituting the first lens 110 with respect to the d-line is preferably 40 or more, and the Abbe number of the material constituting the second lens 120 with respect to the d-line is 50. As described above, the Abbe number with respect to the d line of the material constituting the third lens 130 is set to 40 or less, and the Abbe number with respect to the d line of the material constituting the fourth lens 150 is set to 50 or more. By selecting the material of each lens so as to satisfy such conditions, chromatic aberration can be corrected appropriately. Specifically, the first lens 110 and the second lens 120 are located closer to the object side than the aperture stop 140, and the first lens 110 and the second lens 120, which are negative lenses, increase as the Abbe number of each material constituting them increases. The lateral chromatic aberration generated at 120 is reduced. Similarly, the chromatic aberration of magnification can be corrected better as the Abbe number of the material constituting the third lens 130 that is the positive lens is closer to the object side than the aperture stop 140.

Furthermore, the imaging lens 100 embodying the present invention is preferably configured to satisfy the following conditional expression.
2W ≧ 130 °
However, 2W is the total angle of view of the light ray incident on the maximum image height position on the imaging plane.

A wide-angle lens has a narrower incident angle with respect to the image plane than the telephoto lens, so the focus shift due to temperature fluctuations must be suppressed as much as possible.However, satisfying the above conditions makes it suitable as a surveillance camera or an in-vehicle camera. The angle of view can be secured.
Further, the imaging lens 100 embodying the present invention is preferably configured to satisfy the conditional expressions (2) to (5).
−10.0 ≦ f1 / f ≦ −6.0 (2)
−5.0 ≦ f2 / f ≦ −3.0 (3)
3.0 ≦ f3 / f ≦ 5.0 (4)
2.0 ≦ f4 / f ≦ 6.0 (5)
Where f is the focal length of all lenses, f1 is the focal length of the first lens 110, f2 is the focal length of the second lens 120, f3 is the focal length of the third lens 130, and f4 is the focal length of the fourth lens 150. is there.

  If the upper limit of (2) is exceeded, the negative refractive power increases, and the correction of chromatic aberration of magnification becomes easy, but the curvature of the first lens 110 image side surface R2 becomes too small, making manufacture difficult. When the lower limit is exceeded, the curvature of the object side surface R1 of the first lens 110 becomes small, so that the effective diameter becomes large and it becomes difficult to reduce the size of the lens system.

  When the upper limit value of (3) is exceeded, the negative refractive power becomes strong, so that the curvature of the second lens 120 image side surface R4 becomes too small. Further, along with this, the curvature of the third lens object side surface R3 becomes too small, which makes it difficult to manufacture. When the lower limit is exceeded, the negative refractive power decreases and the positive refractive power of the third lens 130 decreases, making it difficult to correct chromatic aberration of magnification.

  Exceeding the upper limit of (4) makes it difficult to correct chromatic aberration of magnification because the positive refractive power is insufficient. If the lower limit is exceeded, the curvature of the object side surface R5 of the third lens 130 becomes too small, making manufacture difficult.

  Since the fourth lens 150, in particular, the image side surface R9 is greatly corrected for aberrations, if the upper limit of (5) is exceeded, the positive refractive power becomes too small, making it difficult to correct the aberrations. On the other hand, if the lower limit is exceeded, the curvature of the fourth lens 150 image side surface R9 becomes too small, making manufacture difficult.

  Examples 1 to 5 according to specific numerical values of the imaging lens 100 are shown below. In the numerical examples of Examples 1 to 5, the focal length, F number, angle of view, image height, total lens length, and back focus (BF) are as shown in Table 1 below. Similarly, in the numerical examples of Examples 1 to 5, the numerical data of the conditional expressions (1) to (5) are the values described in Table 2 below.

<Example 1>
The basic configuration of the lens system in the first embodiment is shown in FIG. 2, each numerical data (setting value) is shown in Tables 3 and 4, and the aberration diagram showing spherical aberration, distortion, and astigmatism is shown in FIG. Each is shown.

  As shown in FIG. 2, the first lens 110 has a meniscus shape with a convex surface facing the object side, the second lens 120 has a meniscus shape with a convex surface facing the object side, and the third lens 130 has a flat surface with the convex surface facing the object side. The fourth lens 150 disposed on the image side of the convex shape and the aperture stop 140 has a meniscus shape with the convex surface facing the image side. Each of the second lens 120 and the fourth lens 150 has an aspheric surface on both sides. Further, as shown in the figure, the distance between the R1 surface 1 and the R2 surface 2 that is the thickness of the first lens 110 is D1, and the distance between the R2 surface 2 of the first lens 110 and the r3 surface 3 of the second lens 120 is D2. The distance between the R3 surface 3 and the R4 surface 4 that is the thickness of the second lens 120 is D3, the distance between the R4 surface 4 of the second lens 120 and the R5 surface 5 of the third lens 130 is D4, and The distance between the R5 surface 5 and the R6 surface 6 that is the thickness is D5, the distance between the R6 surface 6 of the third lens 130 and the surface 7 of the aperture stop 140 is D6, the surface 7 of the aperture stop 140 and the fourth lens 150. The distance between the R8 surface 8 is D7, the distance between the R8 surface 8 and the R9 surface 9 which is the thickness of the fourth lens 150 is D8, and the distance between R99 of the fourth lens 150 and the imaging surface 160 is D9.

Table 3 shows the stop corresponding to each surface number of the imaging lens 100A in Example 1, the radius of curvature R, the interval D, the refractive index Nd, and the dispersion value νd of each lens. In Table 3, the surface with * in the surface number indicates an aspherical shape. Table 4 shows the aspheric coefficient of the predetermined surface.
Numerical example 1

  3A shows a spherical aberration (435.8 nm, 486.1 nm, 546.1 nm, 587.6 nm, 656.3 nm from the left) and FIG. 3B shows an astigmatism (solid line: left) in Example 1. 35.8nm, 486.1nm, 546.1nm, 587.6nm, 656.3nm sagittal rays, dotted line: 435.8nm, 486.1nm, 546.1nm, 587.6nm, 656.3nm tangential rays from the left), Figure 3 (C) Distortion aberrations (435.8 nm, 486.1 nm, 546.1 nm, 587.6 nm, and 656.3 nm overlap) are shown. 3B and 3C, the vertical axis represents the half field angle ω. In FIG. 3B, the solid line S represents the sagittal image plane value, and the broken line T represents the tangential image plane value. . The same applies to FIGS. 5, 7, 9, and 11.

As can be seen from FIG. 3, according to the first embodiment, spherical, distorted, and astigmatism aberrations are satisfactorily corrected, and an imaging lens excellent in imaging performance can be obtained.
<Example 2>
The basic configuration of the lens system in the second embodiment is shown in FIG. 4, each numerical data (setting value) is shown in Tables 5 and 6, and aberration diagrams showing spherical aberration, distortion, and astigmatism are shown in FIG. Each is shown.

  The imaging lens 100B in the second embodiment is designed for the purpose of facilitating manufacture by increasing the focal length of L1 in the first embodiment and decreasing the curvature of the image side surface. Hereinafter, the focal length of the first lens 110 is L1, the focal length of the second lens 120 is L2, the focal length of the third lens 130 is L3, and the focal length of the fourth lens is L4.

  As shown in FIG. 4, the first lens 110 has a meniscus shape with a convex surface facing the object side, the second lens 120 has a meniscus shape with a convex surface facing the object side, and the third lens 130 has a flat surface with the convex surface facing the object side. The fourth lens 150 disposed on the image side of the convex shape and the aperture stop 140 has a meniscus shape with the convex surface facing the image side. Each of the second lens 120 and the fourth lens 150 has an aspheric surface on both sides.

Table 3 shows the stop corresponding to each surface number of the imaging lens 100B in Example 2, the radius of curvature R, the interval D, the refractive index Nd, and the dispersion value νd of each lens. In Table 5, the surface numbered with * indicates that the surface is aspherical. Table 6 shows the aspheric coefficient of the predetermined surface.
Numerical example 2

5A is a spherical aberration (435.8 nm, 486.1 nm, 546.1 nm, 587.6 nm, 656.3 nm from the left) and FIG. 5B is an astigmatism (solid line: left) in Example 2. (5) to 435.8nm, 486.1nm, 546.1nm, 587.6nm, 656.3nm sagittal rays, dotted line: 435.8nm, 486.1nm, 546.1nm, 587.6nm, 656.3nm tangential rays from the left). Distortion aberrations (435.8 nm, 486.1 nm, 546.1 nm, 587.6 nm, and 656.3 nm overlap) are shown. As can be seen from FIG. 5, according to the second embodiment, the spherical lens, the distortion, and the astigmatism are satisfactorily corrected, and an imaging lens excellent in imaging performance can be obtained.
<Example 3>
The basic configuration of the lens system according to Embodiment 3 is shown in FIG. 6, each numerical data (setting value) is shown in Tables 7 and 8, and the aberration diagram showing spherical aberration, distortion, and astigmatism is shown in FIG. Each is shown.

  The imaging lens 100 </ b> C in the third embodiment is designed for easy manufacture by increasing the focal length of L <b> 1 in the second embodiment and decreasing the curvature of the image side surface.

  As shown in FIG. 6, the first lens 110 has a meniscus shape with a convex surface facing the object side, the second lens 120 has a meniscus shape with a convex surface facing the object side, and the third lens 130 has a flat surface with the convex surface facing the object side. The fourth lens 150 disposed on the image side of the convex shape and the aperture stop 140 has a meniscus shape with the convex surface facing the image side. Each of the second lens 120 and the fourth lens 150 has an aspheric surface on both sides.

Table 7 shows the stop corresponding to each surface number of the imaging lens 100C in Example 3, the radius of curvature R, the interval D, the refractive index Nd, and the dispersion value νd of each lens. In Table 7, the surface numbered with * indicates that the surface is aspherical. Table 8 shows the aspheric coefficient of the predetermined surface.
Numerical Example 3

7A is a spherical aberration (435.8 nm, 486.1 nm, 546.1 nm, 587.6 nm, 656.3 nm from the left), and FIG. 7B is an astigmatism (solid line: solid line: Example 3). Sagittal rays of 435.8nm, 486.1nm, 546.1nm, 587.6nm, 656.3nm from the left, dotted line: tangential rays of 435.8nm, 486.1nm, 546.1nm, 587.6nm, 656.3nm from the left), Fig. 7 (C) Shows distortion aberrations (435.8 nm, 486.1 nm, 546.1 nm, 587.6 nm, and 656.3 nm overlapping), respectively. As can be seen from FIG. 7, according to the third embodiment, spherical, distorted, and astigmatism aberrations are satisfactorily corrected, and an imaging lens excellent in imaging performance can be obtained.
<Example 4>
The basic configuration of the lens system in the fourth embodiment is shown in FIG. 8, each numerical data (setting value) is shown in Tables 9 and 10, and the aberration diagram showing spherical aberration, distortion, and astigmatism is shown in FIG. Each is shown.

  The imaging lens 100D according to the fourth embodiment is designed for easy manufacture by reducing the curvature of the L1 image side surface while observing the balance of the focal lengths of L2 and L4.

  As shown in FIG. 8, the first lens 110 has a meniscus shape with a convex surface facing the object side, the second lens 120 has a meniscus shape with a convex surface facing the object side, and the third lens 130 has a flat surface with the convex surface facing the object side. The fourth lens 150 disposed on the image side of the convex shape and the aperture stop 140 has a meniscus shape with the convex surface facing the image side. Each of the second lens 120 and the fourth lens 150 has an aspheric surface on both sides.

Table 9 shows the stop corresponding to each surface number of the imaging lens 100D in Example 4, the radius of curvature R, the interval D, the refractive index Nd, and the dispersion value νd of each lens. In Table 9, the surface numbered with * indicates that the surface is aspherical. Table 10 shows the aspheric coefficient of the predetermined surface.
Numerical Example 4

FIG. 9 shows the spherical aberration (435.8 nm, 486.1 nm, 546.1 nm, 587.6 nm, 656.3 nm from the left) and FIG. 9B shows the astigmatism (solid line: solid line) in Example 4. Sagittal rays of 435.8nm, 486.1nm, 546.1nm, 587.6nm, 656.3nm from the left, dotted lines: 435.8nm, 486.1nm, 546.1nm, 587.6nm, 656.3nm tangential rays from the left), Fig. 9 (C) Shows distortion aberrations (435.8 nm, 486.1 nm, 546.1 nm, 587.6 nm, and 656.3 nm overlapping), respectively. As can be seen from FIG. 9, according to Example 4, various aberrations of spherical surface, distortion, and astigmatism are satisfactorily corrected, and an imaging lens excellent in imaging performance can be obtained.
<Example 5>
The basic configuration of the lens system according to Embodiment 5 is shown in FIG. 10, each numerical data (setting value) is shown in Tables 11 and 12, and aberration diagrams showing spherical aberration, distortion, and astigmatism are shown in FIG. Each is shown.

  The imaging lens 100E according to the fifth embodiment is designed to maintain a high MTF even when the balance between the focal lengths of L2 and L4 is changed.

  As shown in FIG. 10, the first lens 110 has a meniscus shape with a convex surface facing the object side, the second lens 120 has a meniscus shape with a convex surface facing the object side, and the third lens 130 has a flat surface with the convex surface facing the object side. The fourth lens 150 disposed on the image side of the convex shape and the aperture stop 140 has a meniscus shape with the convex surface facing the image side. Each of the second lens 120 and the fourth lens 150 has an aspheric surface on both sides.

Table 11 shows the stop corresponding to each surface number of the imaging lens 100E in Example 5, the radius of curvature R, the interval D, the refractive index Nd, and the dispersion value νd of each lens. In Table 11, a surface numbered with * indicates that it has an aspherical shape. Table 12 shows the aspheric coefficient of the predetermined surface.
Numerical Example 5

  11A is a spherical aberration (435.8 nm, 486.1 nm, 546.1 nm, 587.6 nm, 656.3 nm from the left), and FIG. 11B is an astigmatism (solid line: left) in Example 5. 115.8C, 486.1nm, 546.1nm, 587.6nm, 656.3nm sagittal rays, dotted line: 435.8nm, 486.1nm, 546.1nm, 587.6nm, 656.3nm tangential rays from the left), Figure 11 (C) Distortion aberrations (435.8 nm, 486.1 nm, 546.1 nm, 587.6 nm, and 656.3 nm overlap) are shown. As can be seen from FIG. 11, according to the fifth embodiment, spherical, distorted, and astigmatism aberrations are corrected well, and an imaging lens excellent in imaging performance can be obtained.

100, 100A, 100B, 100C, 100D, 100E ... Imaging lens 110 ... First lens 120 ... Second lens 130 ... Third lens 140 ... Aperture stop 150 ... Fourth lens 160 ... Imaging surface (imaging device)

Claims (5)

In order from the object side, a first lens having a negative refractive power with a convex surface facing the object side, a second lens made of a resin material having a negative refractive power with a convex surface facing the object side, and a spherical surface, a third lens having a positive refractive power with a convex surface facing the object side, an aperture stop, and a fourth lens formed with the convex surface facing the image side of a resin material you have a direction Tadashi Kita refractive power An imaging lens satisfying the following conditional expressions (1) to (5):
−0.9 ≧ f2 / f4 ≧ −1.1 (1)
−10.0 ≦ f1 / f ≦ −6.0 (2)
−5.0 ≦ f2 / f ≦ −3.0 (3)
3.0 ≦ f3 / f ≦ 5.0 (4)
2.0 ≦ f4 / f ≦ 6.0 (5)
Where f is the focal length of all lenses, f1 is the focal length of the first lens, f2 is the focal length of the second lens , f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens.       The Abbe number of the material constituting the first lens is 40 or more with respect to the d line, the Abbe number of the material constituting the second lens is 50 or more with respect to the d line, and the material constituting the third lens is with respect to the d line. The imaging lens according to claim 1, wherein the Abbe number is set to 40 or less, and the Abbe number for the d-line of the material constituting the fourth lens is set to 50 or more. Wherein the second lens fourth lens, the imaging lens according to claim 1 or 2, characterized in that at least one surface of each aspheric surfaces.       The imaging lens according to claim 1, wherein the third lens is made of a glass material. 5. The imaging lens according to claim 1, wherein a total angle of view of the imaging lens satisfies the following conditional expression.
2W ≧ 130 °
However, 2W is a full angle of view.